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//////////////////////////////////////////////////////////////////////
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//// ////
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//// eth_rxaddrcheck.v ////
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//// ////
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//// This file is part of the Ethernet IP core project ////
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//// http://www.opencores.org/cores/ethmac/ ////
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//// ////
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//// Author(s): ////
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//// - Bill Dittenhofer (billditt@aol.com) ////
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//// ////
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//// All additional information is avaliable in the Readme.txt ////
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//// file. ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2001 Authors ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: not supported by cvs2svn $
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// Revision 1.8 2002/11/19 17:34:52 mohor
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// AddressMiss status is connecting to the Rx BD. AddressMiss is identifying
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// that a frame was received because of the promiscous mode.
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//
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// Revision 1.7 2002/09/04 18:41:06 mohor
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// Bug when last byte of destination address was not checked fixed.
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//
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// Revision 1.6 2002/03/20 15:14:11 mohor
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// When in promiscous mode some frames were not received correctly. Fixed.
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//
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// Revision 1.5 2002/03/02 21:06:32 mohor
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// Log info was missing.
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//
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//
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// Revision 1.1 2002/02/08 12:51:54 ditt
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// Initial release of the ethernet addresscheck module.
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//
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//
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//
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//
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//
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`include "timescale.v"
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module eth_rxaddrcheck(MRxClk, Reset, RxData, Broadcast ,r_Bro ,r_Pro,
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ByteCntEq2, ByteCntEq3, ByteCntEq4, ByteCntEq5,
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ByteCntEq6, ByteCntEq7, HASH0, HASH1,
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CrcHash, CrcHashGood, StateData, RxEndFrm,
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Multicast, MAC, RxAbort, AddressMiss, PassAll,
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ControlFrmAddressOK
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);
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parameter Tp = 1;
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input MRxClk;
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input Reset;
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input [7:0] RxData;
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input Broadcast;
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input r_Bro;
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input r_Pro;
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input ByteCntEq2;
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input ByteCntEq3;
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input ByteCntEq4;
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input ByteCntEq5;
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input ByteCntEq6;
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input ByteCntEq7;
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input [31:0] HASH0;
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input [31:0] HASH1;
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input [5:0] CrcHash;
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input CrcHashGood;
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input Multicast;
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input [47:0] MAC;
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input [1:0] StateData;
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input RxEndFrm;
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input PassAll;
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input ControlFrmAddressOK;
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output RxAbort;
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output AddressMiss;
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wire BroadcastOK;
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wire ByteCntEq2;
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wire ByteCntEq3;
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wire ByteCntEq4;
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wire ByteCntEq5;
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wire RxAddressInvalid;
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wire RxCheckEn;
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wire HashBit;
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wire [31:0] IntHash;
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reg [7:0] ByteHash;
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reg MulticastOK;
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reg UnicastOK;
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reg RxAbort;
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reg AddressMiss;
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assign RxAddressInvalid = ~(UnicastOK | BroadcastOK | MulticastOK | r_Pro);
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assign BroadcastOK = Broadcast & ~r_Bro;
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assign RxCheckEn = | StateData;
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// Address Error Reported at end of address cycle
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// RxAbort clears after one cycle
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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RxAbort <= 1'b0;
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else if(RxAddressInvalid & ByteCntEq7 & RxCheckEn)
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RxAbort <= 1'b1;
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else
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RxAbort <= 1'b0;
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end
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// This ff holds the "Address Miss" information that is written to the RX BD status.
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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AddressMiss <= 1'b0;
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else if(ByteCntEq7 & RxCheckEn)
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AddressMiss <= (~(UnicastOK | BroadcastOK | MulticastOK | (PassAll & ControlFrmAddressOK)));
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end
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// Hash Address Check, Multicast
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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MulticastOK <= 1'b0;
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else if(RxEndFrm | RxAbort)
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MulticastOK <= 1'b0;
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else if(CrcHashGood & Multicast)
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MulticastOK <= HashBit;
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end
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// Address Detection (unicast)
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// start with ByteCntEq2 due to delay of addres from RxData
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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UnicastOK <= 1'b0;
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else
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if(RxCheckEn & ByteCntEq2)
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UnicastOK <= RxData[7:0] == MAC[47:40];
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else
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if(RxCheckEn & ByteCntEq3)
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UnicastOK <= ( RxData[7:0] == MAC[39:32]) & UnicastOK;
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else
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if(RxCheckEn & ByteCntEq4)
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UnicastOK <= ( RxData[7:0] == MAC[31:24]) & UnicastOK;
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else
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if(RxCheckEn & ByteCntEq5)
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UnicastOK <= ( RxData[7:0] == MAC[23:16]) & UnicastOK;
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else
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if(RxCheckEn & ByteCntEq6)
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UnicastOK <= ( RxData[7:0] == MAC[15:8]) & UnicastOK;
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else
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if(RxCheckEn & ByteCntEq7)
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UnicastOK <= ( RxData[7:0] == MAC[7:0]) & UnicastOK;
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else
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if(RxEndFrm | RxAbort)
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UnicastOK <= 1'b0;
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end
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assign IntHash = (CrcHash[5])? HASH1 : HASH0;
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always@(CrcHash or IntHash)
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begin
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case(CrcHash[4:3])
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2'b00: ByteHash = IntHash[7:0];
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2'b01: ByteHash = IntHash[15:8];
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2'b10: ByteHash = IntHash[23:16];
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2'b11: ByteHash = IntHash[31:24];
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endcase
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end
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assign HashBit = ByteHash[CrcHash[2:0]];
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endmodule
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